Is Mary the one that is supposed to be saying this?
Yep. I guess anyone who's not Catholic is out of luck.
BTW, Catholics are not required to believe ANY of these apparitions, as they are all considered private. Those which are approved by the Church (a mere bishop can, in this case, be considered "the Church") are supposed to be free of error, but I've got questions about this one.
Fatima, and LaSalette, and apparitions to Simon Stock have stood the test of time.
This one has not.